Can I use WebSocket under a Free plan?
Yes, however, it is limited to 15 minutes of connection time per day. The paid plans do not have this limitation. A better way to test our WebSocket using a Free plan would be via Sandbox. More information about the Sandbox environment can be found here: https://support.coinapi.io/hc/en-us/articles/6342454022813-Do-you-provide-a-Sandbox-Environment-for-testing-